The Cox - Knox controversy at Frankfurt

During the reign of Queen Mary, Richard Cox and John Knox both had to hang out in Europe. They eventually got into each others hair with the problem of how to accept the common book of prayers into their doctrinal issues (see also Richard T. Hughes, C. Leonard Allen, Illusions of Innocence: Protestant Primitivism in America 1650-1875, Chicago (University of Chicago Press) 1988, esp. pp.7-14; for a quick summary of the story, see here.)

These troubles were written up after the fact by someone, possibly William Whittingham, though some have argued against that, and published.

A Brief Discourse of the Troubles at Frankfort,... (an older version, tough to read: A brieff discours of the troubles begonne at Franckfort in Germany, Anno Domini 1554)

Some of the quotes therein, especially this one, shows the continuity of concern between the Reformation and the Restoration.

For what greater treasure, or sweeter comfort, can a Christian man desire than to have a Church wherein he may serve GOD in purity of faith and integrity of life; … (p.26)